Coustic 160SE - Manual (Page 9)

SYMPTOM PROBABLE CAUSE
8. Whining noise when Reroute power cable from battery to source unit directly,
engine is running with noise bypassing the battery terminal in the fuse box.
varying with the accelerator Check power connections to be sure they are clean.
(noise level varies with Check ground connections to be sure the ground wire is in
source unit volume control). direct contact with the bare metal surface of the chassis (with
that spot scraped clean of any paint).
9. Constant level whining noise Check for a ground loop in the system. Turn the system off
(most noise with source unit and one by one change the ground connections
volume at minimum) (by changing to a different contact point,scraping the level
constant irrespective of metal clean of any paint, rust or
grease). Turn the system on and check for whining noise after
each ground change.
CAUTION: Do not disconnect the Power Amplifier's ground when
the system is on. This could damage the amplifier.
Check for defective signal cables. Disconnect signal cables
at the amplifier and listen carefully for noise. If the noise dis-
appears, run a test pair of signal cables. If there is no unde-
sirable whining noise, reconnect to the amplifier with the new
pair of signal cables. Check battery ground connection to the
vehicle chassis to make sure it is tight and clean.
Check battery negative terminal connection to make sure it is
tight and clean.
10. Radiated noise: crackling Check if the noise is actually radiated noise: Tune a portable
noise on FM which is not radio to the same FM station. Move the portable radio close
present when playing tape to the vehicle engine. If crackling noise comes from the
or CD (noise varying slightly portable radio, then the noise you have in your vehicle audio
with accelerator, but is system is radiated noise.
present at all times) Check with a VOM to make sure the antenna is really ground-
ed to the vehicle chassis.
To ensure a true ground, break the plastic covering of the
antenna lead and solder a piece of heavy wire (minimum 14-
gauge) to the braided shield.
Ground the other end of the wire at the same point as the
radio ground.
Check spark plug wires. They should be suppression-type
wire and less than 2 years old. Otherwise, replace them with
good quality suppression cables.
Make sure engine block is grounded to the vehicle chassis at
a bare metal spot (scraped clean of paint, rust and grease).
Make sure hood is also grounded. If not, use a ground strap
(which is available from any auto parts store) to ground the
hood to the vehicle chassis.
SPECIFICATIONS:
160SE
Rated Power @ 14.4 V (0.1 % THD): 4 Ohm Stereo 2 x 40 Watts
Rated Power @ 14.4 V (0.1 % THD): 2 Ohm Stereo 2 x 80 Watts
Rated Power @ 14.4 V (0.2 % THD): 4 Ohm Mono 1 x 160 Watts
Frequency Response: 20 –20,000 Hz +/- 0.5 dB
Input Sensitivity: 0.1 – 5 V
S/N Ratio @ rated power: 100 dB
High-Pass Filter Crossover Frequency: 80 / 120 Hz (18 dB/Oct.)
Low-Pass Filter Crossover Frequency: 80 / 120 Hz (18 dB/Oct.)
Dimensions: 11" W X 2 3/8" X 7 1/4" L (280 X 60 X 185 mm)
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